PDF malware analysis — malicious · 8e6b8310fbba7596

MALICIOUS

PDF

4.1 KB

MD5: e441fabd3cd0b825f2b89eca04f797ec SHA-1: a2e012a735135b4d95f2e5c38ccbcee29138348c SHA-256: 8e6b8310fbba75963ed38b9458c9f3c69a4cb4b49c143adcebe5c34d28ee10b8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Dropper.Agent-7281741-0, indicating it is a dropper. Static analysis revealed embedded JavaScript, including calls to eval() and String.fromCharCode(), suggesting obfuscation. The ML classifier also strongly indicated maliciousness. The primary function appears to be downloading and executing a second-stage payload, as indicated by the dropper classification and the presence of obfuscated JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7281741-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7281741-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `c8ca25951f348b54b4910ecac8417969945a8a5fa07a4f933912bc4012c138e5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6361 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `45d95d7c89d906746b5fb70f69b22d92d7bfc0b11279f920c4d66b6aa47ad1bd`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3616 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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